干湿循环对土-水特征曲线影响的预测模型  

PREDICTION MODEL OF SOIL-WATER CHARACTERISTIC CURVE CONSIDERING THE INFLUENCE OF DRYING-WETTING CYCLES

作　　者：陈勇[1] 王智炜 戴明月 刘梦琴 邓合玉 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《工业建筑》2017年第12期21-25,95,共6页Industrial Construction

基　　金：国家自然科学基金青年基金项目(51409149)

摘　　要：土-水特征曲线在非饱和土的研究中占有重要地位,目前用来预测土-水特征曲线的模型尚有待完善。引用生物学中的Logistic曲线方程,建立了能够较好预测非饱和土的土-水特征曲线的Logistic模型;并以某滑坡土作为试验土样,完成了3次干湿循环过程的土-水特征曲线;然后采用改进的Logistic模型对巴东滑坡土、南阳膨胀土及厦门残积土的试验数据进行拟合分析,发现Logistic模型可以较好地拟合土-水特征曲线,并建立了模型参数与干湿循环次数的关系,从而提出了一种预测模型,可以根据第1次干湿循环试验数据预测多次干湿循环后的土-水特征曲线关系,同时验证了该模型的适用性。Soil-water Characteristic Curves（SWCC） plays an important role in the study of unsaturated soil,and the models still need to be improved to predict the SWCC better.A model was established by using the Logistic curve equation in biology to predict the SWCC of unsaturated soilwell.Taking the landslide soil as test samples,three cycles of wetting-drying tests were carried out.Then,the improved Logistic model was used to analyze and fit the test data of Badong landslide soil,Nanyang expansive soil and Xiamen residual soil.According to the fitting results,it was found that the Logistic model could better fit the SWCC,and the relationship between the model parameters and the number of wetting-drying cycles was established,then the SWCC model could be predicted according to the first dryingwetting cycle experiment data.

关 键 词：非饱和土 土-水特征曲线 干湿循环 LOGISTIC模型 

分 类 号：TU43[建筑科学—岩土工程]